Are these transistors ok?

[aaronhance]

I'm thinking of using these transistors to switch a 12v 120w heater and a 12v 40w heater, would they be ok to use for this? Also will these heat sinks be good for them? Thanks again, in advance!

[c4757p]

Eh... you can do better for the 120W heater, you're wasting rather a lot in the FET. How's this? Should barely need a heat sink.

Of course, it might not matter if the FET will be dissipating heat into the same space as the heater. It'll just contribute a bit of heat itself. All depends on your application.

[Delta]

I'd look for a FET with a lower on resistance - RDS(on).

120W at 12v is 10A, so 10A through that device with an on resistance of 110 milliohms means it will be dissipating 11 Watts - not too good.

PS.  Remember that you'll need to drive the gate with at least 10v, not the 5 or 3.3v from an MCU....

[aaronhance]

Ok, thanks for the help! I guess I drive them using a second transistor with a lower control voltage, since I have 12v on the board already!

[madires]

Logic level (5V): IRL1404
12V: IRF2805

[aaronhance]

Logic level (5V): IRL1404
12V: IRF2805

Hi, thanks, I was looking at a similar part. 

[Marco]

Does it have to be through hole? If not you're spoiled for choice. IRL1404 is a nice part but you can find much cheaper solutions.

If it has to be through hole the choice of cheap parts in low volume is a bit limited, but there's stuff like AOI514.